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Anti-static roll cover

a roll cover and anti-static technology, applied in the field of anti-static roll cover, can solve the problems of static buildup on preprinted sheet material, historic and troublesome problem for printers, web/sheet guidance problems, and particulate contamination on the surface of preprinted sheet material, etc., to achieve the effect of convenient installation, low cost and disposabl

Inactive Publication Date: 2000-09-19
BBA NONWOVENS SIMPSONVILLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In a preferred embodiment, the transfer roll cover has an inner surface which includes an elastic or heat-shrinkable yarn and a nylon base yarn that provides strength and holds the cover together. This enables the roll cover to be installed snugly onto the transfer roll and to transfer electrostatic charges to the roll. The outer surface consists of a looped rayon yarn for cleaning the preprinted sheet, and a looped conductive yarn to provide the antistatic properties. The conductive looped yarns are knitted into the roll cover structure in such a manner that they intertwine with the inner surface and make conductive contact with the transfer roll thus providing a direct conductive path between the printed sheet and the roll to ensure that electrostatic charges are dissipated.
The transfer roll cover of the present invention solves the static charge buildup problem while at the same time cleans the surface of the preprinted sheet or transported web material. It is also easy to install, inexpensive, and disposable, yet effective to solve the static and debris problems.

Problems solved by technology

Static buildup on preprinted sheet material is an historic and troublesome problem for the printer.
The resulting static buildup can cause web / sheet guidance problems.
A second problem involves particulate contamination on the surface of the preprinted sheet.
Particulate contamination is strongly attracted to a statically charged sheet or web and often degrades print quality.
The prior art devices are effective under limited conditions but do not solve the problem entirely.
Trials have shown that in some circumstances the use of a cover to remove particulates from the sheets can exacerbate static problems and cause particulate contamination to be attracted to the sheets later in the process.

Method used

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Embodiment Construction

Referring to FIG. 1, a transfer roll cover in accordance with the present invention has an inner surface 10 made of conductive and elastic material that fits onto and makes conductive contact with a transfer roll 12 which is made of metal or other conductive material. Preferably, the inner surface 10 includes a combination of elastic yarns to provide elasticity and nylon yarns to provide strength. The elastic yarns ensure that the sleeve fits snugly around the transfer roll 12. A suitable elastic yarn is sold under the tradename 420 Denier LYCRA.TM. by Dupont Company in the U.S. A suitable nylon yarn is sold under the tradename 70 Denier Two-Ply Nylon by Jefferson Mills, Inc., in the U.S. An alternate inner surface construction can utilize heat-shrinkable yarn or other material (in place of the elastic yarn) which is activated by applying heat to the cover after the cover is installed on the roll.

The outer surface 14 of the roll cover is made of a composite of looped yarns which are...

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Abstract

A transfer roll cover has an inner surface made of conductive and elastic material to fit snugly around and make conductive contact with a transfer roll, and an outer surface made of looped yarns which are attached to the inner surface and have outer looped ends which make light rolling contact with a sheet transported over the transfer roll. The looped yarns are a composite of a cleaning yarn for cleaning particulate contaminants and an antistatic yarn for removing static charges from the transported sheet. In a preferred embodiment, the transfer roll cover has an inner surface made of nylon knitted yarn as a base yarn that holds the cover together and a LYCRA TM inlayed yarn which has an elasticity that allows the cover to stretch over and fit snugly onto the transfer roll. As an alternative, a heat-shrinkable polyvinyl acetate (PVA) yarn may be used as the elastic material. The preferred outer surface includes rayon knitted yarn with looped outer ends as the cleaning yarn, and BEKINTEX TM conductive knitted yarn with looped outer ends as the antistatic yarn.

Description

This invention generally relates to a roll cover for printing presses and web fed converting equipment, and more particularly, to a roll cover having a simplified construction with anti-static and particulate removal properties.BACKGROUND OF INVENTIONStatic buildup on preprinted sheet material is an historic and troublesome problem for the printer. Static charges tend to build up when the sheet or web material is transported through a printing press. The resulting static buildup can cause web / sheet guidance problems. A second problem involves particulate contamination on the surface of the preprinted sheet. Particulate contamination is strongly attracted to a statically charged sheet or web and often degrades print quality.Printing press manufacturers have attempted to deal with the static charge buildup problem by using various types of static elimination devices which are wrapped around printing rolls or festooned around a printing press. These devices conduct static charges to a ...

Claims

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Application Information

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IPC IPC(8): B08B6/00B41N10/04B41N10/00B65H27/00
CPCB08B6/00B65H27/00B41N7/00B65H2301/511B65H2301/5133Y10T428/1362B41N2207/02B41N2207/14B65H2404/1831Y10T442/413Y10T442/425Y10T428/23957Y10T428/23979
Inventor CHIRICOSTA, ROBERT A.HARRIS, THOMAS W.MAJOR, STEPHEN P.OAKHILL, JEREMY M.PATE, DOUGLAS J.BUFFORD, ARTIS CLIFFORD
Owner BBA NONWOVENS SIMPSONVILLE
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